GC_Customize_Widgets::override_sidebars_widgets_for_theme_switch()

	public function override_sidebars_widgets_for_theme_switch() {
		global $sidebars_widgets;

		if ( $this->manager->doing_ajax() || $this->manager->is_theme_active() ) {
			return;
		}

		$this->old_sidebars_widgets = gc_get_sidebars_widgets();
		add_filter( 'customize_value_old_sidebars_widgets_data', array( $this, 'filter_customize_value_old_sidebars_widgets_data' ) );
		$this->manager->set_post_value( 'old_sidebars_widgets_data', $this->old_sidebars_widgets ); // Override any value cached in changeset.

		// retrieve_widgets() looks at the global $sidebars_widgets.
		$sidebars_widgets = $this->old_sidebars_widgets;
		$sidebars_widgets = retrieve_widgets( 'customize' );
		add_filter( 'option_sidebars_widgets', array( $this, 'filter_option_sidebars_widgets_for_theme_switch' ), 1 );
		// Reset global cache var used by gc_get_sidebars_widgets().
		unset( $GLOBALS['_gc_sidebars_widgets'] );
	}